Customized Product Ergonomics Evaluation Technology And Application Based On 3D Body Scanning

Nowadays, goods and products have been increasingly enriched. Comfort, usability, and ergonomics factors get more and more considered and emphasized than before. In this context, the customized products, which are produced according to user's body configuration, interest, hobbies, personality and demands, have become popular. Customized products make life more comfortable and convenient. It has become a vital trend in goods development."Userinfo" such as body shape is the fundamental information for customized products. How to dig and describe "Userinfo" accurately, how to provide guidance during whole design process, how to test and evaluate whether digital product model fits "Userinfo" before manufacturing, which are three main hot-spot issues in design and manufacture field for customized products.In this dissertation, 3D body scanning technology and ergonomics evaluation was introduced into customized product's field. In virtual environment, an ergonomics evaluation system, which could import optimized 3D human models, simulate gestures, execute ergonomics evaluation and feedback results, was built. This system had two main advantages: First, "Userinfo" could affect all the design phases, so the customized product was best suited; Second, Ergonomics evaluation could be done in digital product model stage, so it could optimize the design model, increase efficiency, save resource.Based on summarizing customized products designing, 3D body scanning, ergonomics simulation and evaluation technology, the main contents of this dissertation are as following:(1) In order to optimize human models to achieve the ergonomics simulation, 3D body scanning and repairing technology was researched. "Feature template" was proposed to decrease the number of faces with features maintained;(2) In order to build models which suited "mass customization", the somatotyping of Chinese people was studied. A new generating model method was proposed based on clustering results, which made human model approach reality.(3) Posture prediction method and skin deformation technology were applied in ergonomics simulation. Interpolation of quaternion was introduced to optimize both skin-skeleton mixing algorithm and key frames interpolation algorithm.(4) Parameters of some standard ergonomics evaluation methods were modified based on Chinese characteristics. Some extended methods, such as "reach envelope" and "view cone", were also proposed by experiments and/or mathematical modeling methods. (5) A prototype of customized product ergonomics evaluation system was developed to validate the key technology. Two representative cases were studied to verify the prototype's usability.Finally, summarized the dissertation and describe the future of ergonomics evaluation technology and application for customized products.